Update README with required 5.2.1 note
Update README with required 5.2.1 note

kmurthy1/nuage-kubernetes,nuagenetworks/nuage-kubernetes,nuagenetworks/nuage-kubernetes,nuagenetworks/nuage-kubernetes,kmurthy1/nuage-kubernetes,vareti/nuage-kubernetes,vareti/nuage-kubernetes,kmurthy1/nuage-kubernetes,vareti/nuage-kubernetes,kmurthy1/nuage-kubernetes,vareti/nuage-kubernetes,nuagenetworks/nuage-kubernetes